function toggleRows(elm) {
  var rows = document.getElementsByTagName("TR");
  elm.style.backgroundImage = "url(/images/RightArrow.gif)";
  var newDisplay = "none";
  var thisID = elm.parentNode.parentNode.parentNode.id + "-";
  for (var i = 0; i < rows.length; i++) {
    var r = rows[i];
    if (matchStart(r.id, thisID, true)) {
      if (r.style.display == "none") {
        if (document.all) newDisplay = "block"; //IE4+ specific code
        else newDisplay = "table-row"; //Netscape and Mozilla
        elm.style.backgroundImage = "url(/images/DownArrow.gif)";
      }
      break;
    }
  }

// When expanding, only expand one level.  Collapse all desendants.
  var matchDirectChildrenOnly = (newDisplay != "none");
  for (var j = 0; j < rows.length; j++) {
    var s = rows[j];
    if (matchStart(s.id, thisID, matchDirectChildrenOnly)) {
      s.style.display = newDisplay;
      var cell = s.getElementsByTagName("TD")[0];
      var tier = cell.getElementsByTagName("DIV")[0];
      var folder = tier.getElementsByTagName("A")[0];
      if (folder.getAttribute("onclick") != null) {
        folder.style.backgroundImage = "url(/images/RightArrow.gif)";
      }
    }
  }
}

function matchStart(target, pattern, matchDirectChildrenOnly) {
  var pos = target.indexOf(pattern);
  if (pos != 0) return false;
  if (!matchDirectChildrenOnly) return true;
  if (target.slice(pos + pattern.length, target.length).indexOf("-") >= 0) return false;
  return true;
}

function collapseAllRows() {
  var rows = document.getElementsByTagName("TR");
  for (var j = 0; j < rows.length; j++) {
    var r = rows[j];
    if (r.id.indexOf("-") >= 0) {
      r.style.display = "none";    
    }
  }
}